Two-revolution printing press



Jan. 3, 1956 P. DIETRICH r-:r/u.

TWO-REVOLUTION PRINTING PRESS Filed May 12, 1951 S W D S TWN N A E L MNEG u D T L A 2 M 2 w Y 8% H IIJYWUL 9 MR 4 w m P P (H m H M :rIIILT w.."a

United States Patent 2,729,163 TWO-REVOLUTION PRINTING PRESS PaulDietrich and Emii Koliand, Augsburg, Germany, assignors toMaschinenfabrik Augsbnrg-Nurnberg A. G., Augsburg, Germany, acorporation of Germany Application May 12, 1951, Serial No. 225362Claims priority, application Germany May 17, 1950 Claims. (Cl. 101-256)This invention relates to a two-revolution printing press of the type inwhich the reciprocating type bed is driven by a toothed rack, a toothedsegment, and a shaft from a toothed segment positioned laterally of thetype bed, which toothed segment bears at each end of its toothing anextension with cycloidal recess and is driven alternately by either oftwo oppositely moved toothed segments at the end of each of which ismounted a roller for alternating engagement in the cycloidal recessesfor retarding and accelerating the movement of the type bed. Byproviding a special ratio between the total swinging period of thetoothed segment bearing the cycloidal recesses and the time ofengagement of the rollers in the cycloidal recesses it is possible toreduce their retarding and accelerating effect to such an extent thatseparate retarding and accelerating devices, e. g. in the form of airbuffers, can be dispensed with. Therefore, the toothed driving rack canbe arranged in the middle plane of the type bed without anydifliculties.

However, since in this type of type bed drive the toothed segment comesto lie halfway between the side walls of the machine frame,approximately in the middle of the type bed track, i. e., closelybeneath the axis of the impression cylinder defining the impression linein which the very strong pressure forces between the impression cylinderand the type bed are acting, it causes special difliculties to designthe main transverse girder of the machine frame in such a way, in thecourse of the impression line, that it is able to resist the heavypressure forces without any flexible action. Such possible flexibility,however, is of a decisive importance for the quality of the printing; anabsolutely rigid construction of the hearing of the impression cylinderand of the support of the type bed by the main transverse girder of themachine frame in the region of the impression line tends to reduce theamount of work required for making ready the impression cylinder whichhitherto owing to the flexibility in the middle of the cylinder had tobe more thorough in the middle of the cylinder than outside. Theposition of the toothed segment for driving the toothed rack of the typebed would not admit of the provision of a continuous upper chorddirectly beneath the impression line.

It is an object of the present invention to provide a tworevolutionprinting press which combines maximum stiffness and maximum simplicityof construction.

With this and further objects in view, which will hereinafter appear,according to the present invention a continuous upper girder for themain transverse support is provided and made sufficiently stiif againstbending by supporting the tracks for the type bed below the impressioncylinder by single vertical stays bearing on the lower chord of aconstructional element taking the transverse forces (e. g. a stay or atruss) connecting in a slanting course the lower chord arrangedvertically or approximately vertically underneath the impression lineand the continuous upper chord extending laterally of the impressionline, and forming together with these chords the main transverse girderof the machine frame.

The lower chord in this case is advantageously constructed in the formof a horizontal girder for taking the lateral components of the verticalforces and has, for instance, a slightly U-shaped form. A maximum ofstiffness is obtained by drawing apart the upper and lower chords as faras possible and arranging them in the upper and lower planes of theframe, respectively.

In this construction of the main transverse girder of the machine frameit does not make any difference that the constructional elementinterconnecting the upper and lower chords in a slanting directionrequires a recess or bulging in the region of the swinging motion of thetoothed driving segment.

Other and further objects, features and advantages of the invention willbe pointed out hereinafter and appear in the appended claims formingpart of the application.

In the accompanying drawings a now preferred embodiment of the inventionis shown by way of illustration and not by way of limitation.

Fi g. 1 is a side view of the machine,

Fig. 2 is a cross section on the line Il-II of Fig. l, and

Fig. 3 is a fragmentary view of the drive.

Similar reference numerals denote similar parts in the different views.

Referring now to the drawings in greater detail, it will be seen thatthe sheets coming from the feeding apparatus 1 are fed to the impressioncylinder 4 via the feeding table 3 by means of the well known feedingdevice 2 and taken along by the impression cylinder, whereby the sheetis printed by the matter 6 over which the ink has been distributed bythe inking apparatus 5, whereupon the printed sheets are fed to thedelivery pile board 8, by the chain delivery 7 having two grippers 58,58'. The composition 6 is enclosed in a type bed 9 which is supported,by four slide guides 10, in corresponding tracks 11 of the machineframe. Each track 11 rests on vertical supports 12, which in turn aresupported on the lower chord 13 of the main transverse girder of themachine frame formed in connection with the slanting stay 14 and theupper chord 16. The vertical stays 12 underneath each track 11 terminatein ribs 17 connected with the front walls 18. As shown, the lower chord13 is slightly L -shaped. The upper chord 16 is laterally displaced inrelation to the impression line in such a way that the toothed segment19 in spite of its straight direction can pass by the same, said toothedsegment driving the rack 20 provided in the middle of the type bed 9 formoving the same to and fro. The stay 14 is bulged at 21 to provide spacefor free movement of the toothed segment 19' The toothed segment 19 ismounted on a shaft 22 which is supported at 23 and 24 and bears outsideof the side wall 25' of the machine frame a toothed segment 26 which, asshown in Fig. 3, is formed at each end with a projection 27 having acycloidal recess 28. The toothed segment 26 engages alternately atoothed segment 29 and a toothed segment 29', said segments 2? and 29'being fastened to two oppositely rotating toothed wheels 36 or 36',respectively. At the end of each toothed se ment 29, 29 is provided aroller 31, 31' for alternate engagement in the cycloidal recesses 28,whereby the movement of the toothed segment 26 on engagement of oneroller and disengagement of the other roller is retarded or accelerated.Conventional means (not shown) are provided for driving the toothedwheels 3% and 30 in opposite directions, by insertion of a reversingwheel, from the driving shaft 32.

While the invention has been described in detail with respect to a nowpreferred example and embodiment of the invention it will be understoodby those skilled in the art after understanding the invention, thatvarious changes and modifications may be made without departing from thespirit and scope of the invention and it is intended, therefore, tocover" all such changes and modifications in the appended claims.

W at is claimed is:

1. A printing press of the character described comprising a press bed, atype bed mounted on said press bed for reciprocating movement from oneend to the other, tracks on said press bed for guiding and supportingsaid type bed during said reciprocating movement, an impression cylindermounted transversely over said press bed intermediate the ends thereof,said impression cylinder defining an impression line of maximum pressuretransversely of said press bed, a toothed rack on the bottom of saidtype bed substantially in the middle thereof, gear means under saidpress bed cooperating with said toothed rack for driving said type bedin said reciprocating motion, said gear means protruding upwardlythrough said press bed substantially beneath said impression cylinder, alower transverse chord adjacent the bottom of said press substantiallyaligned with said impression line, an upper transverse chord supportingsaid press bed disposed to one side of said impression line, a slantingweb rigidly interconnecting said lower and said upper chords and meetingsaid lower chord vertically below said impression line, a bulge in saidweb defining an operating housing for said gear means, and substantiallyT-shaped vertical stays disposed longitudinally of said press bedsupporting said tracks on the upper portions of said stays,substantially the entire force of said stays resting on said lowerchord.

2. A printing press of the character described comprising a press bed, atype bed mounted on said press bed for reciprocating movement from oneend to the other, tracks on said press bed for guiding and supportingsaid type bed during said reciprocating movement, an impres-. sioncylinder mounted transversely over said press bed intermediate the endsthereof, said impression cylinder defining an impression line of maximumpressure transversely of said press bed, a toothed rack on the bottom ofsaid type bed substantially in the middle thereof, gear means under saidpress bed cooperating with said toothed rack for driving said type bedin said reciprocating motion, said gear means protruding upwardlythrough said press bed and interrupting the transverse bracing thereofsubstantially beneath said impression cylinder, a lower transverse chordadjacent the bottom of said press sub,- stantially aligned with saidimpression line, an upper transverse chord supporting said press beddisposed to one side of said impression line, a slanting web rigidlyinterconnecting said upper chord with said lower chord along the portionthereof substantially beneath said impression line, and cantileveredvertical stays supporting said tracks and resting entirely on said lowerchord.

3. In a cylinder printing press of the character described having apress bed, an impression cylinder, a reciprocating type bed moving ontracks on said press bed and rack and pinion driving means forreciprocating said type bed mounted substantially in the middle of saidpress bed and interrupting the transverse bracing of said bedsubstantially beneath said impression cylinder, the combinationcomprising a lower transverse chord adjacent the bottom of said printingpress and substantially aligned with the pressure line at which saidimpression cylinder contacts said type bed, an upper transverse chordadjacent said press bed at one side of said pressure line, a rigidslanting web interconnecting said lower and said upper chords, saidslanting web meeting said lower chord along a line vertically beneathsaid pressure line, and cantilevered vertical supports for said type bedtracks, said vertical supports being disposed longitudinally of saidpress bed with substantially the entire force thereof carried by saidlower transverse chord.

4. In a printing press of the character described having a press bed, animpression cylinder, and a reciprocating type bed moving on tracks onsaid press bed and driven by drive means mounted substantially in themiddle of said press bed and interrupting the transverse bracingthereof, a unitary cantilevered support for said press comprising incombination a lower transverse girder adjacent the bottom of said pressand vertically beneath the axis of said impression cylinder, an uppertransverse girder adjacent said press bed and disposed to one side ofthe axis of said impression cylinder, a diagonal supporting webinterconnecting said upper girder with said lower girder along a linethereon substantially directly beneath said axis of said cylinder, and aplurality of substantially T-shaped cantilevered vertical supports forsaid type bed tracks disposed longitudinally of said press bed, saidvertical supports and said diagonal web being carried substantiallyentirely by saidlower transverse girder.

5. In a printing press having an impression cylinder, areciprocatingtype bed mountedon a plurality of longitudinal tracks, and gear meansfor reciprocating said type bed and interrupting the transverse bracingof said printing press substantially beneath said impression cylinder,the combination which comprises a single lower transverse girder forsupporting substantially the entire weight of said press and disposedvertically beneath the axis of said impression cylinder, an uppertransverse girder longitudinally offset from the axis of said impressioncylinder, a single inclined transverse web rigidly interconnecting saidupper girder with said, lower girder along a line, substantiallyvertically aligned with the axis of. said impression cylinder fortransmitting printing forces on said bed to said lower girder directlybeneath the axis of ,said cylinder, and a plurality of longitudinallydisposed, cantilevered vertical supports for said type bed tracks, eachof said cantilevered supports being carried substantiallyv entirely bysaid lower girder.

References Cited in the file of this patent UNITED STATES PATENTS1,715,712 Koppe June 4, 1929 2,030,173 Kelly Feb. 11, 1936 2,517,210Jenner Aug. 1, 1950

